# encoding=utf-8
import os.path
import zlib

####   Basic crc tools   ####
crc_table = [
    0x00, 0x31, 0x62, 0x53, 0xc4, 0xf5, 0xa6, 0x97,
    0xb9, 0x88, 0xdb, 0xea, 0x7d, 0x4c, 0x1f, 0x2e,
    0x43, 0x72, 0x21, 0x10, 0x87, 0xb6, 0xe5, 0xd4,
    0xfa, 0xcb, 0x98, 0xa9, 0x3e, 0x0f, 0x5c, 0x6d,
    0x86, 0xb7, 0xe4, 0xd5, 0x42, 0x73, 0x20, 0x11,
    0x3f, 0x0e, 0x5d, 0x6c, 0xfb, 0xca, 0x99, 0xa8,
    0xc5, 0xf4, 0xa7, 0x96, 0x01, 0x30, 0x63, 0x52,
    0x7c, 0x4d, 0x1e, 0x2f, 0xb8, 0x89, 0xda, 0xeb,
    0x3d, 0x0c, 0x5f, 0x6e, 0xf9, 0xc8, 0x9b, 0xaa,
    0x84, 0xb5, 0xe6, 0xd7, 0x40, 0x71, 0x22, 0x13,
    0x7e, 0x4f, 0x1c, 0x2d, 0xba, 0x8b, 0xd8, 0xe9,
    0xc7, 0xf6, 0xa5, 0x94, 0x03, 0x32, 0x61, 0x50,
    0xbb, 0x8a, 0xd9, 0xe8, 0x7f, 0x4e, 0x1d, 0x2c,
    0x02, 0x33, 0x60, 0x51, 0xc6, 0xf7, 0xa4, 0x95,
    0xf8, 0xc9, 0x9a, 0xab, 0x3c, 0x0d, 0x5e, 0x6f,
    0x41, 0x70, 0x23, 0x12, 0x85, 0xb4, 0xe7, 0xd6,
    0x7a, 0x4b, 0x18, 0x29, 0xbe, 0x8f, 0xdc, 0xed,
    0xc3, 0xf2, 0xa1, 0x90, 0x07, 0x36, 0x65, 0x54,
    0x39, 0x08, 0x5b, 0x6a, 0xfd, 0xcc, 0x9f, 0xae,
    0x80, 0xb1, 0xe2, 0xd3, 0x44, 0x75, 0x26, 0x17,
    0xfc, 0xcd, 0x9e, 0xaf, 0x38, 0x09, 0x5a, 0x6b,
    0x45, 0x74, 0x27, 0x16, 0x81, 0xb0, 0xe3, 0xd2,
    0xbf, 0x8e, 0xdd, 0xec, 0x7b, 0x4a, 0x19, 0x28,
    0x06, 0x37, 0x64, 0x55, 0xc2, 0xf3, 0xa0, 0x91,
    0x47, 0x76, 0x25, 0x14, 0x83, 0xb2, 0xe1, 0xd0,
    0xfe, 0xcf, 0x9c, 0xad, 0x3a, 0x0b, 0x58, 0x69,
    0x04, 0x35, 0x66, 0x57, 0xc0, 0xf1, 0xa2, 0x93,
    0xbd, 0x8c, 0xdf, 0xee, 0x79, 0x48, 0x1b, 0x2a,
    0xc1, 0xf0, 0xa3, 0x92, 0x05, 0x34, 0x67, 0x56,
    0x78, 0x49, 0x1a, 0x2b, 0xbc, 0x8d, 0xde, 0xef,
    0x82, 0xb3, 0xe0, 0xd1, 0x46, 0x77, 0x24, 0x15,
    0x3b, 0x0a, 0x59, 0x68, 0xff, 0xce, 0x9d, 0xac
]


def _crc8_impl(byte_data):
    # https://zhuanlan.zhihu.com/p/114049042
    # g(x) = x^8 + x^5 + x^4 + 1
    #        b'1001 10001', drop first
    crc = 0x00
    for byte in byte_data:
        crc = crc_table[(crc ^ byte) & 0xff]
    return crc

####   Basic file compress decompress  ####
def compress_file(file_path: str):
    with open(file_path, 'rb') as file:
        raw_data = file.read()
        return zlib.compress(raw_data)


def decompress_file(byte_data: bytes):
    return zlib.decompress(byte_data)


if __name__ == '__main__':
    file_path = "sample-data/sample-image.jpg"
    size1 = os.path.getsize(file_path)

    compress_data = compress_file(file_path)
    size2 = len(compress_data)

    rate = (size1 - size2) / size1 * 100
    print("OriSize: {}, CompressSize: {}, rate: {}".format(
        size1, size2, rate
    ))


